Polysiloxane modified epoxy resin and preparation method thereof

A technology of polysiloxane and epoxy resin, which is applied in the field of polysiloxane modified epoxy resin and its preparation, can solve the problems of poor UV aging resistance and poor flexibility, and achieve convenient technical parameters and short reaction cycle Short, energy-reducing effect

Inactive Publication Date: 2019-10-08
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to improve the problems of poor flexibility and UV aging resistance of epoxy resin after curing, the present invention provides a novel polysiloxane modified epoxy resin and its preparation method, which can be used in the realization of epoxy resin On the basis of toughening, it can also improve the UV aging resistance of epoxy resin

Method used

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  • Polysiloxane modified epoxy resin and preparation method thereof
  • Polysiloxane modified epoxy resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] According to the proportioning of reactant, take 100g bisphenol A type epoxy resin E44 and 80g hydroxyl-terminated polydimethylsiloxane and place in the there-necked flask equipped with agitator, condensing reflux, nitrogen device and constant pressure dropping funnel , add ethylene glycol butyl ether to dissolve, 0.8g catalyst dibutyltin dilaurate is installed in the constant pressure funnel, nitrogen gas is passed into the three-necked flask, when the oil bath is heated to 70°C, the catalyst is added dropwise at a constant speed, and the dropwise addition is completed Finally, it was heated to 110°C at a stirring rate of 300rpm, reacted at a constant temperature for 2 hours, then added toluene to extract and remove unreacted polysiloxane, and then distilled under reduced pressure to remove ethylene glycol butyl ether to obtain a polysiloxane-modified ring Pure oxygen resin.

Embodiment 2

[0029] According to the proportioning of reactant, get 100g bisphenol A type epoxy resin E51 and 60g polymethylphenyl siloxane and place in the there-necked flask that agitator, condensation reflux, nitrogen device and constant pressure dropping funnel are equipped, Add xylene to dissolve, 1.2g catalyst titanate is installed in the constant pressure funnel, and nitrogen gas is passed into the three-necked flask. When the oil bath is heated to 80°C, the catalyst is added dropwise at a constant speed. After the dropwise addition, stir at 350rpm Heating to 130°C under high speed, constant temperature reaction for 3.5h, then adding n-hexane to extract and remove unreacted polysiloxane, and then distilling off xylene under reduced pressure to obtain pure polysiloxane modified epoxy resin.

Embodiment 3

[0031] According to the proportioning of reactant, get 100g bisphenol A type epoxy resin E51 and 100g polymethylphenyl siloxane and place in the there-necked flask that agitator, condensation reflux, nitrogen device and constant pressure dropping funnel are equipped, Add ethylene glycol butyl ether to dissolve, 2g catalyst dibutyltin dilaurate is housed in the constant pressure funnel, feed nitrogen into the three-necked flask, when the oil bath is heated to 80°C, add the catalyst dropwise at a constant speed, after the dropwise addition, Heated to 140°C at a stirring rate of 400rpm, reacted at a constant temperature for 4.5h, then extracted with heptane to remove unreacted polysiloxane, and then distilled off ethylene glycol butyl ether under reduced pressure to obtain a polysiloxane modified ring Pure oxygen resin.

[0032] figure 1 It is the comparison chart of infrared spectrum of unmodified epoxy resin (a), polysiloxane (b) and polysiloxane modified epoxy resin (c) prepa...

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Abstract

The invention discloses polysiloxane modified epoxy resin and a preparation method thereof. The preparation method comprises the following steps: firstly mixing and dissolving epoxy resin and polysiloxane in an organic solvent, dropwise adding a catalyst at a temperature of 60-100 DEG C in a nitrogen environment, then carrying out stirring for reacting to obtain polysiloxane modified epoxy resin,removing unreacted polysiloxane after the reaction is finished, and carrying out reduced-pressure distillation to remove the organic solvent to obtain the pure modified resin. The polysiloxane modified epoxy resin prepared by the invention can be cured into a film at room temperature, the obtained coating has good flexibility and impact resistance, the ultraviolet aging resistance is remarkably improved, and the service life is greatly prolonged. In addition, the process is simple, and energy consumption is low.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a polysiloxane-modified epoxy resin and a preparation method thereof. Background technique [0002] Epoxy resin has excellent adhesion, excellent electrical insulation, good mechanical properties, good corrosion resistance and chemical resistance, but its weather resistance, flexibility and impact resistance are not ideal. This limits its wider application. [0003] Polysiloxane is a polymer with Si-O-Si bond as the main chain. The bond energy of silicon-oxygen bond can reach 460kJ / mol, which is higher than the ultraviolet energy in sunlight (315-415kJ / mol). Therefore, polysiloxane Oxane has excellent UV aging resistance. Polysiloxane also has excellent properties such as high and low temperature resistance, weather resistance, corrosion resistance, electrical insulation, oxidation resistance stability, and low surface tension. However, silicone resins have disadva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/14C08G77/42
CPCC08G59/14C08G77/42
Inventor 汪炳叔孙裕超
Owner FUZHOU UNIV
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